body{
    background-color:#F9F9F9;
}
.div_nav1{
    width:auto;
    height:50px;
    background-color:#F3F3F3;
    border:1px #E4E4E4 solid;
}
.div_side{
    width:5px;
    height:20px;
    background-color:#1ABC9C;
    margin-top:15px;
}
.div_font1{
    width:100px;
    height:20px;
    font-size:15px;
    color:#999999;
    margin-left:8px;
    margin-top:15px;
}
.div_btn1{
    margin-left:800px;
    margin-top:-53px;
}
.div_btn2{
    margin-left:700px;
    margin-top:-60px;
}
.div_addcourse{
    width:800px;
    height:1338px;
    margin-top:20px;
    margin-left:10px;
}
.div_tap{
    width:150px;
    height:40px;
    background-color:#9EA7B4;
}
.div_transparent {
    width: 0px;
    height: 0px;
    border-top: 20px solid transparent;
    border-right: 20px solid transparent;
    border-left: 20px solid #9EA7B4;
    border-bottom: 20px solid transparent;
    margin-left:150px;
    margin-top:-30px;
}
.font{
    width:100px;
    height:20px;
    color:white;
    margin-left:15px;
    padding-top:10px;
}
i{
    color:white;
}
#course_form{
    width:600px;
    height:1060px;
    margin-left:130px;
}
.div_forms{
    margin-top:30px;
    margin-left:30px;
}
span{
    color:#F04844;
}
button{
    width:80px;
    height:30px;
    background-color:#1ABC9C;
    margin-left:130px;
    margin-top:30px;
    border:hidden;
    color:white;
}
.div_td1{
    width:180px;
}
.div_td1 label{
    padding-left:90px;
    margin-right:20px;
}
.div_td2{
    width:400px;
}
.div_td2 img{
    margin-left:250px;
    margin-top:-50px;
}
.div_td2 textarea{
    width:300px;
    height:100px;
}
.div_td2 input{
    width:250px;
    height:40px;
}
.div_td2 button{
    width:200px;
    height:40px;
    margin-left:0px;
    margin-top:-3px;
}
.td2_font{
    color:red;
}
.div_table{
    height:1100px;
    border-collapse:separate;
    border-spacing:0px 10px;
}
.div_video video{
    width:300px;
    height:220px;
    margin-top:-10px;
}
.div1{
    height:0px;
    opacity:0;
}
.look_picture img{
    width:150px;
    height:150px;
    border:1px #D7D7D7 solid;
    background-color:white;
    margin-top:-10px;
    margin-left:1px;
}
#submit_id button{
    width:150px;
    height:50px;
    background-color:#1ABC9C;
    border-radius: 5px;
    border-color:#1ABC9C;
}
#submit_id{
    color: white;
    text-align: center;
    margin-top:-30px;
    font-size:17px;
}